.NET C# Create a file and open it using Default Application Type

public static void OpenFileWithDefaultApplication(string fullfileLocationAndName, byte[] data)

{

try

{

System.IO.FileStream fs =   new System.IO.FileStream(fullfileLocationAndName, System.IO.FileMode.Create, System.IO.FileAccess.ReadWrite);

fs.Write(data, 0, data.Length - 1);

fs.Close();

fs.Dispose();

System.Diagnostics.Process.Start(fullfileLocationAndName);

}

catch (Exception ex)

{

MessageBox.Show("There was an error opening the file: " + ex.Message);

}

}